EP 0909366 A4 19990421 -
Publication
Application
Priority
- US 9711313 W 19970701
- US 2110796 P 19960703
- US 87915797 A 19970619
Abstract (en)
[origin: US5993344A] A unidirectional roller chain sprocket for use primarily in automotive engine chain drive applications which incorporates an asymmetrical tooth for improved noise reduction. The asymmetrical tooth profile incorporates a flank flat which is tangent to an engaging flank radius and a first root radius. The asymmetrical tooth profile also incorporates one or more inclined root surfaces which provide tooth space clearance for maintaining the chain rollers in hard contact with the root surface in the sprocket wrap. The asymmetrical tooth profile further incorporates pitch mismatch wherein the sprocket chordal pitch is less than the chain chordal pitch to facilitate a "staged" roller-tooth contact as a roller moves into full mesh from an initial tangential impact at the flank flat.
IPC 1-7
IPC 8 full level
F16G 13/02 (2006.01); F16G 13/04 (2006.01); F16G 13/06 (2006.01); F16H 7/06 (2006.01); F16H 55/30 (2006.01)
CPC (source: EP US)
F16G 13/06 (2013.01 - EP US); F16H 7/06 (2013.01 - EP US); F16H 55/30 (2013.01 - EP US)
Citation (search report)
- [X] US 1808369 A 19310602 - MUNROE TREADWAY B
- [X] FR 2325804 A1 19770422 - CHRYSLER FRANCE [FR]
- [X] EP 0671573 A1 19950913 - WULF ERICH & SOHN [DE]
- [A] US 4116081 A 19780926 - LUTTRELL RICHARD W, et al
- [A] PATENT ABSTRACTS OF JAPAN vol. 014, no. 287 (M - 0988) 21 June 1990 (1990-06-21)
- See references of WO 9800656A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5993344 A 19991130; BR 9710126 A 19990810; CA 2259497 A1 19980108; CA 2259497 C 20051227; DE 69720217 D1 20030430; DE 69720217 T2 20030925; EP 0909366 A1 19990421; EP 0909366 A4 19990421; EP 0909366 B1 20030326; JP 2002514287 A 20020514; JP 4107683 B2 20080625; US 5921878 A 19990713; WO 9800656 A1 19980108
DOCDB simple family (application)
US 31080499 A 19990512; BR 9710126 A 19970701; CA 2259497 A 19970701; DE 69720217 T 19970701; EP 97933209 A 19970701; JP 50436098 A 19970701; US 87915797 A 19970619; US 9711313 W 19970701